Extrusion apparatus for coating insulation over wires and cables



 

1. IN AN EXTRUSION APPARATUS HAVING A DIE FOR APPLYING MATERIAL ABOUT A CORE WHEREIN THE ORIFICE OF THE DIE IS OF SUCH SHAPE IN CROSS-SECTION WITH RESPECT TO SAID CORE AS TO PRESENT ZONES HAVING DIFFERENT DEGREES OF RESTRICTION TO THE FLOW OF MATERIAL; THE IMPROVEMENT COMPRISING PROVIDING THE DIE WITH AN OUTWARD EXTENSION OF THE ORIFICE WALL ALONG THE MARGIN OF THE DIRECTION OF FLOW IN THE ZONE OF LESS RESTRICTION TO EQUALIZE SUBSTANTIALLY THE RESTRICTION TO FLOW ABOUT SAID CORE THROUGHOUT THE CROSS-SECTION OF THE ORIFICE. 